<template>
  <div class="container">
    <div class="left-board">
      <div class="logo-wrapper">
        <div class="logo">
          Vue3 Form Generator
          <a
            class="github"
            href="https://github.com/yupk/form-generator-vue3"
            target="_blank"
          >
            <img src="https://github.githubassets.com/pinned-octocat.svg" alt />
          </a>
        </div>
      </div>
      <el-scrollbar class="left-scrollbar">
        <div class="components-list">
          <div v-for="(item, listIndex) in leftComponents" :key="listIndex">
            <div class="components-title">
              <svg-icon icon-class="component" />
              {{ item.title }}
            </div>
            <draggable
              class="components-draggable"
              :list="item.list"
              :group="{ name: 'componentsGroup', pull: 'clone', put: false }"
              :clone="cloneComponent"
              draggable=".components-item"
              :sort="false"
              @end="onEnd"
            >
              <div
                v-for="(element, index) in item.list"
                :key="index"
                class="components-item"
                @click="addComponent(element)"
              >
                <div class="components-body">
                  <svg-icon :icon-class="element.__config__.tagIcon" />
                  {{ element.__config__.label }}
                </div>
              </div>
            </draggable>
          </div>
        </div>
      </el-scrollbar>
    </div>

    <div class="center-board">
      <div class="action-bar">
        <el-button icon="el-icon-video-play" type="text" @click="updateCode">
          保存代码
        </el-button>
        <el-button icon="el-icon-view" type="text" @click="showJson">
          查看json
        </el-button>
        <el-button icon="el-icon-download" type="text" @click="download">
          导出vue文件
        </el-button>
        <el-button
          class="copy-btn-main"
          icon="el-icon-document-copy"
          type="text"
          @click="copy"
        >
          复制代码
        </el-button>
        <el-button class="delete-btn" icon="el-icon-delete" type="text" @click="empty">
          清空
        </el-button>
      </div>
      <el-scrollbar class="center-scrollbar" :class="device">
        <el-form
          :size="formConf.size"
          :label-position="formConf.labelPosition"
          :disabled="formConf.disabled"
          :label-width="formConf.labelWidth + 'px'"
          style="padding: 10px; height: 100%"
        >
          <draggable
            class="drawing-board"
            component="el-row"
            :gutter="formConf.gutter"
            :list="drawingList"
            :animation="340"
            group="componentsGroup"
          >
            <draggable-item
              v-for="(item, index) in drawingList"
              :key="item.renderKey"
              :drawing-list="drawingList"
              :current-item="item"
              :index="index"
              :active-id="activeId"
              :form-conf="formConf"
              @activeItem="activeFormItem"
              @copyItem="drawingItemCopy"
              @deleteItem="drawingItemDelete"
            />
          </draggable>
          <div v-show="!drawingList.length" class="empty-info">
            从左侧拖入或点选组件进行表单设计
          </div>
        </el-form>
      </el-scrollbar>
    </div>

    <right-panel
      :active-data="activeData"
      :form-conf="formConf"
      :show-field="!!drawingList.length"
      @tag-change="tagChange"
      @fetch-data="fetchData"
    />

    <form-drawer
      v-model="drawerVisible"
      :form-data="formData"
      size="100%"
      :generate-conf="generateConf"
    />
    <div>
      <json-drawer
        size="60%"
        v-model="jsonDrawerVisible"
        :json-str="JSON.stringify(formData)"
        @refresh="refreshJson"
      />
    </div>

    <code-type-dialog
      v-model="dialogVisible"
      title="选择生成类型"
      :show-file-name="showFileName"
      @confirm="generate"
    />
    <input id="copyNode" type="hidden" />
  </div>
</template>

<script>
  import { VueDraggableNext } from "vue-draggable-next";
  import { debounce } from "throttle-debounce";
  import { saveAs } from "file-saver";
  import ClipboardJS from "clipboard";
  import render from "@/components/render/render";
  import FormDrawer from "./FormDrawer.vue";
  import JsonDrawer from "./JsonDrawer.vue";
  import RightPanel from "./RightPanel.vue";

  import axios from "axios";

  import {
    inputComponents,
    selectComponents,
    layoutComponents,
    formConf,
  } from "@/components/generator/config";
  import {
    exportDefault,
    beautifierConf,
    isNumberStr,
    titleCase,
    deepClone,
    isObjectObject,
  } from "@/utils/index";
  import {
    makeUpHtml,
    vueTemplate,
    vueScript,
    cssStyle,
  } from "@/components/generator/html";
  import { makeUpJs } from "@/components/generator/js";
  import { makeUpCss } from "@/components/generator/css";
  import drawingDefalut from "@/components/generator/drawingDefalut";
  import logo from "@/assets/logo.png";
  import CodeTypeDialog from "./CodeTypeDialog.vue";
  import DraggableItem from "./DraggableItem.vue";
  import {
    getDrawingList,
    saveDrawingList,
    getIdGlobal,
    saveIdGlobal,
    getFormConf,
  } from "@/utils/db";
  import loadBeautifier from "@/utils/loadBeautifier";

  let beautifier;
  const emptyActiveData = {
    style: {},
    autosize: {},
  };
  let oldActiveId;
  let tempActiveData;
  const drawingListInDB = getDrawingList();
  const formConfInDB = getFormConf();
  const idGlobal = getIdGlobal();

  export default {
    name: "Home",
    emits: ["updateCode"],
    props: ["device"],

    components: {
      draggable: VueDraggableNext,
      render,
      FormDrawer,
      JsonDrawer,
      RightPanel,
      CodeTypeDialog,
      DraggableItem,
    },
    data() {
      return {
        logo,
        idGlobal: 1,
        formConf,
        inputComponents,
        selectComponents,
        layoutComponents,
        labelWidth: 100,
        drawingList: drawingDefalut,
        drawingData: {},
        activeId: drawingDefalut[0].formId,
        drawerVisible: false,
        formData: {},
        dialogVisible: false,
        jsonDrawerVisible: false,
        generateConf: null,
        showFileName: false,
        activeData: drawingDefalut[0],
        saveDrawingListDebounce: debounce(340, saveDrawingList),
        saveIdGlobalDebounce: debounce(340, saveIdGlobal),
        leftComponents: [
          {
            title: "输入型组件",
            list: inputComponents,
          },
          {
            title: "选择型组件",
            list: selectComponents,
          },
          {
            title: "布局型组件",
            list: layoutComponents,
          },
        ],
      };
    },
    computed: {},
    watch: {
      // eslint-disable-next-line func-names
      "activeData.__config__.label": function (val, oldVal) {
        if (
          this.activeData.placeholder === undefined ||
          !this.activeData.__config__.tag ||
          oldActiveId !== this.activeId
        ) {
          return;
        }
        this.activeData.placeholder =
          this.activeData.placeholder.replace(oldVal, "") + val;
      },
      activeId: {
        handler(val) {
          oldActiveId = val;
        },
        immediate: true,
      },
      drawingList: {
        handler(val) {
          this.saveDrawingListDebounce(val);
          if (val.length === 0) this.idGlobal = 100;
        },
        deep: true,
      },
      idGlobal: {
        handler(val) {
          this.saveIdGlobalDebounce(val);
        },
        immediate: true,
      },
    },
    mounted() {
      if (Array.isArray(drawingListInDB) && drawingListInDB.length > 0) {
        this.drawingList = drawingListInDB;
      } else {
        this.drawingList = drawingDefalut;
      }
      this.activeFormItem(this.drawingList[0]);
      if (formConfInDB) {
        this.formConf = formConfInDB;
      }
      loadBeautifier((btf) => {
        beautifier = btf;
      });
      const clipboard = new ClipboardJS("#copyNode", {
        text: (trigger) => {
          const codeStr = this.generateCode();
          this.$notify({
            title: "成功",
            message: "代码已复制到剪切板，可粘贴。",
            type: "success",
          });
          return codeStr;
        },
      });
      clipboard.on("error", (e) => {
        this.$message.error("代码复制失败");
      });
    },
    methods: {
      setObjectValueReduce(obj, strKeys, data) {
        const arr = strKeys.split(".");
        arr.reduce((pre, item, i) => {
          if (arr.length === i + 1) {
            pre[item] = data;
          } else if (!isObjectObject(pre[item])) {
            pre[item] = {};
          }
          return pre[item];
        }, obj);
      },
      setRespData(component, resp) {
        const { dataPath, renderKey, dataConsumer } = component.__config__;
        if (!dataPath || !dataConsumer) return;
        const respData = dataPath.split(".").reduce((pre, item) => pre[item], resp);

        // 将请求回来的数据，赋值到指定属性。
        // 以el-tabel为例，根据Element文档，应该将数据赋值给el-tabel的data属性，所以dataConsumer的值应为'data';
        // 此时赋值代码可写成 component[dataConsumer] = respData；
        // 但为支持更深层级的赋值（如：dataConsumer的值为'options.data'）,使用setObjectValueReduce
        this.setObjectValueReduce(component, dataConsumer, respData);
        const i = this.drawingList.findIndex(
          (item) => item.__config__.renderKey === renderKey,
        );
        if (i > -1) {
          this.drawingList[i] = component;
        }
      },
      fetchData(component) {
        const { dataType, method, url } = component.__config__;
        if (dataType === "dynamic" && method && url) {
          this.setLoading(component, true);
          axios.get(url).then((resp) => {
            this.setLoading(component, false);
            console.log(resp.data);
            this.setRespData(component, resp.data);
          });
        }
      },
      setLoading(component, val) {
        const { directives } = component;
        if (Array.isArray(directives)) {
          const t = directives.find((d) => d.name === "loading");
          if (t) t.value = val;
        }
      },
      activeFormItem(currentItem) {
        this.activeData = currentItem;

        this.activeId = currentItem.__config__.formId;
      },
      onEnd(obj) {
        if (obj.from !== obj.to) {
          this.fetchData(tempActiveData);
          this.activeData = tempActiveData;
          this.activeId = this.idGlobal;
        }
      },
      addComponent(item) {
        const clone = this.cloneComponent(item);
        this.fetchData(clone);
        this.drawingList.push(clone);
        this.activeFormItem(clone);
      },
      cloneComponent(origin) {
        const clone = deepClone(origin);
        const config = clone.__config__;
        config.span = this.formConf.span; // 生成代码时，会根据span做精简判断
        this.createIdAndKey(clone);

        if (config.tag == "tinymce") {
          clone.id = "editor_" + this.idGlobal;
        }

        clone.placeholder !== undefined && (clone.placeholder += config.label);
        tempActiveData = clone;
        return tempActiveData;
      },
      createIdAndKey(item) {
        const config = item.__config__;
        config.formId = ++this.idGlobal;
        config.renderKey = `${config.formId}${+new Date()}`; // 改变renderKey后可以实现强制更新组件
        if (config.layout === "colFormItem" && config.tag != "el-divider") {
          item.__vModel__ = `field${this.idGlobal}`;
        } else if (config.layout === "rowFormItem") {
          config.componentName = `row${this.idGlobal}`;
          !Array.isArray(config.children) && (config.children = []);
          delete config.label; // rowFormItem无需配置label属性
        }
        if (Array.isArray(config.children)) {
          config.children = config.children.map((childItem) =>
            this.createIdAndKey(childItem),
          );
        }
        return item;
      },
      AssembleFormData() {
        this.formData = {
          fields: deepClone(this.drawingList),
          ...this.formConf,
        };
      },
      generate(data) {
        const func = this[`exec${titleCase(this.operationType)}`];
        this.generateConf = data;
        console.log(func);
        func && func(data);
      },
      execRun(data) {
        this.AssembleFormData();
        this.drawerVisible = true;
      },
      execDownload(data) {
        const codeStr = this.generateCode();
        const blob = new Blob([codeStr], {
          type: "text/plain;charset=utf-8",
        });
        saveAs(blob, data.fileName);
      },
      updateCode() {
        this.AssembleFormData();
        this.generateConf = this.formConf;
        const codeStr = this.generateCode();
        const jsonStr = JSON.stringify(this.formData);
        this.$emit("updateCode", { codeStr, jsonStr });
      },
      execCopy(data) {
        document.getElementById("copyNode").click();
      },
      empty() {
        this.$confirm("确定要清空所有组件吗？", "提示", {
          type: "warning",
        }).then(() => {
          this.drawingList = [];
          this.idGlobal = 100;
        });
      },
      drawingItemCopy(item, list) {
        let clone = deepClone(item);
        clone = this.createIdAndKey(clone);
        list.push(clone);
        this.activeFormItem(clone);
      },
      drawingItemDelete(index, list) {
        list.splice(index, 1);
        this.$nextTick(() => {
          const len = this.drawingList.length;
          if (len) {
            this.activeFormItem(this.drawingList[len - 1]);
          }
        });
      },
      generateCode() {
        // alert(33);
        const { type } = this.generateConf;

        this.AssembleFormData();

        const script = vueScript(makeUpJs(this.formData, type));

        const html = vueTemplate(makeUpHtml(this.formData, type));

        const css = cssStyle(makeUpCss(this.formData));

        return beautifier.html(html + script + css, beautifierConf.html);
      },
      showJson() {
        this.jsonDrawerVisible = true;
        this.AssembleFormData();
      },
      download() {
        this.dialogVisible = true;
        this.showFileName = true;
        this.operationType = "download";
      },
      run() {
        this.dialogVisible = true;
        this.showFileName = false;
        this.operationType = "run";
      },
      copy() {
        this.dialogVisible = true;
        this.showFileName = false;
        this.operationType = "copy";
      },
      tagChange(newTag) {
        newTag = this.cloneComponent(newTag);
        const config = newTag.__config__;
        newTag.__vModel__ = this.activeData.__vModel__;
        config.formId = this.activeId;
        config.span = this.activeData.__config__.span;
        this.activeData.__config__.tag = config.tag;
        this.activeData.__config__.tagIcon = config.tagIcon;
        this.activeData.__config__.document = config.document;
        if (
          typeof this.activeData.__config__.defaultValue === typeof config.defaultValue
        ) {
          config.defaultValue = this.activeData.__config__.defaultValue;
        }
        Object.keys(newTag).forEach((key) => {
          if (this.activeData[key] !== undefined) {
            newTag[key] = this.activeData[key];
          }
        });
        this.activeData = newTag;
        this.updateDrawingList(newTag, this.drawingList);
      },
      updateDrawingList(newTag, list) {
        const index = list.findIndex((item) => item.__config__.formId === this.activeId);
        if (index > -1) {
          list.splice(index, 1, newTag);
        } else {
          list.forEach((item) => {
            if (Array.isArray(item.__config__.children))
              this.updateDrawingList(newTag, item.__config__.children);
          });
        }
      },
      refreshJson(data) {
        this.drawingList = deepClone(data.fields);
        delete data.fields;
        this.formConf = data;
      },
    },
  };
</script>

<style lang="scss">
  @import "@/styles/home";
  @import "@/styles/index";
  .mobile,
  .pad {
    margin: auto;
    background: #fafafa;
    -webkit-box-shadow: #ebedf0 0 4px 12px;
    box-shadow: 0 4px 12px #ebedf0;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
  }

  .mobile {
    width: 375px;
  }

  .pad {
    width: 768px;
  }
</style>
